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Photo by: Martial Trezzini

Iranian Foreign Minister Mohammad Javad Zarif leaves the hotel, after talks on Iran's nuclear program in Geneva Switzerland, Friday, Nov.22, 2013. Differences on whether Iran has the right to enrich uranium that could be used to make nuclear weapons appeared to be a key sticking point Friday between two top negotiators trying to agree on terms that would start curbing Tehran's atomic activities in exchange for sanctions relief. Iranian Foreign Minister Mohammad Javad Zarif and Catherine Ashton, the European Union's top diplomat, have met repeatedly since Wednesday to hammer out language on a nuclear deal acceptable to both Tehran and six world powers trying to limit Iran's nuclear program. (AP Photo/Keystone,Martial Trezzini)

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